Hewwo from submerged Sheffy
Now then,thanks everyone,,,JR,,this is where my ideas went out the window,,,,the GN does change,,wrecked all my ideas that did,,,
I see that you can actualy work out the NG with distance,ISO,aperture,,,,how the bloody hell are you supposed to know the F No first ??(why does the sb800 have a gn of 125 ??)
As for swivelling the zoom head,,,,,lets not go there !!
Ive ordered Neil van Niekerks book about the subject,,,,should REALLY confuse me !!